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Depends on what you've done. You could try backing out, reverse whatever you've done to the last known good point. Libc for your system can't be messed with. You can, with care and knowledge run multiple versions but your installed OS will depend on the version it and it's software was built with.

@gregm Thanks for the reply; I haven't had time to work it out do to work, but I'll let you know how it turns out.

Luckily, I mounted my /home partition separately from the rest of the system so I am hoping that, if worse comes to worse, I can re-install and not have to start fresh. (At least that's the reason why I divided the drive that way - haven't actually seen it work in practice).